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Ping both sides every 12s, fail a missing pong in 45s, refresh a 60s read deadline on every frame, tighten TCP keepalive to 15s, and reconnect the relay from 500ms up to 10s with an explicit drop reason. Co-authored-by: Daniel <znsoft@163.com>
znsoftm
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September 14, 2026 20:06
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Idle public tunnels were dying after hours with
{"ok":false,"error":"search backend offline","code":"offline"}because NAT / a 90sReadDeadlineclosed the link even though the relay already reconnects.Both ends now keep the TCP path warm and fail dead sessions faster:
KeepAliveConfig+SetKeepAlivePeriod) and on the accepted proxy connmissing pong,read idle timeout, etc.)Shared helpers live in
internal/tunnelwith tests for deadline refresh, pong timeout, backoff, and proxy ping emit/answer.